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银山多金属矿床是一个典型的火山热液矿床。矿区的火山岩和次火山岩划分为两种成因类型,分属于两个火山旋回。两个火山旋回的岩浆均起源于地壳深部或上地幔。第Ⅰ旋回的岩浆受硅铝壳物质混染较强,其成矿能力强;第Ⅱ旋回的岩浆受硅铝壳物质混染微弱,成矿能力则差。两个旋回岩石的成因差别清楚地反映在它们的矿物成分、微量元素和同位素地球化学特征等方面,据此可以确定评价岩体(或岩石系列)含矿性的地质和地球化学准则。
Yinshan polymetallic deposit is a typical volcanic hydrothermal deposit. The volcanic and secondary volcanic rocks in the mining area are divided into two types of genesis, belonging to two volcanic cycles. Both volcanic and volcanic cycles originated in the deep crust or the upper mantle. The I-trending magma was strongly contaminated by sillimanite material and had strong metallogenic ability. The second-cycle magma was slightly contaminated by Si-Al shell material and poor in ore-forming ability. The genetic differences between the two gyroclastic rocks are clearly reflected in their mineral composition, trace elements and isotopic geochemical characteristics, from which geological and geochemical criteria for evaluating ore-bearing properties of the rock mass (or series of rocks) can be determined.